long story short, I've got a friend with a flatbed tow truck, and all along the side of the deck there are little LED lights, 8 or so of them, with 2 leds each, he wants to make them strobe when his light bar turns on, and I offered to do it for him. they are self grounding, and have just a positive lead coming off of them, which run to a single positive wire that runs the length of the deck, the plan is to cut the wire to every second one, and add a second independent positive to these other ones, giving me group 1 and group 2, for a strobe pattern. as it is now, they only come on solid, with the headlights, so I came up with this schematic, which should work to make them strobe any time... let me know what you guys think!
blue is what I need to add to his existing system
blue is what I need to add to his existing system